Weird “bubbling” sensation in Vagina!??

This sounds totally odd, I know. Starting yesterday, I have this super odd “bubbling” sensation in my vagina. I can’t tell if it’s inside, or if it’s on the “lips” and I only feel it when I’m sitting down.

Has anyone felt this before?

I wish I could explain the feeling better. Like bubbling, or could be twitching....

Not sure if I should be “worried” about this and kind of embarrassed to ask my Midwife at my appointment tomorrow.

I’m 17 weeks.